Creating a SaaS offering

1 - Has anyone successfully created a SaaS offering with this (multi tenant etc)
2- If yes, Could you provide some guidance?
3 - Is this allowed ?

Do you mean a Hosting Service for Parse Server? You can find the current providers in the community links:

I meant a product reselling parse services but using a SAAS model (Multi tenant, self service logins etc. ) with a monthly fee

Yes. You can find some companies providing “Parse as a Service” in the link I sent you before.

Thank you -
I wanted to build this to offer it myself.